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# Best O(1) | |
# Worst O(long n) | |
arr = [1,2,3,4,5,6,7,10] | |
def bs (list, elem) | |
low = 0 | |
high = list.length | |
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arr = [9,81,-9,3,0,12,-10] | |
def find_min(list) | |
min = list[0] | |
index = 0 | |
list.each_with_index do |val, i| | |
if val < min | |
min = val | |
index = i | |
end |
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require "serverspec" | |
require "docker" | |
package = ['rake', 'pg'] | |
describe "Dockerfile" do | |
before(:all) do | |
@image = Docker::Image.build_from_dir('.', {'dockerfile'=>'Dockerfile'}) | |
@image.tag(repo: 'image-test', tag: 'latest'). |
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const BOM = '\ufffe' //LE. for BE '\ufeff' | |
func createFile(name string) error { | |
var bytes [2]byte | |
data := `test string UTF-8` | |
file, err := os.Create(name) | |
if err != nil { | |
fmt.Errorf("Can't open file. %v", err) | |
return err |
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=begin | |
Worst time: O(n2) if choose bad pivot element | |
Approximate time: O(n log n) | |
=end | |
def quicksort array | |
if array.length < 2 | |
array | |
else | |
pivot = array[rand(array.length)] |
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# O(|V|+|E|) | |
graph = Hash.new | |
graph["you"] = ["alice", "bob", "claire"] | |
graph["bob"] = ["anuj", "peggy"] | |
graph["alice"] = ["peggy"] | |
graph["claire"] = ["thom", "jonny"] | |
graph["anuj"] = [] | |
graph["peggy"] = [] | |
graph["thom"] = [] |
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graph = {} | |
graph['start'] = Hash.new | |
graph['start']['a'] = 6 | |
graph['start']['b'] = 2 | |
graph['a'] = Hash.new | |
graph['a']['fin'] = 1 | |
graph['b'] = Hash.new | |
graph['b']['a'] = 3 | |
graph['b']['fin'] = 5 |
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fib = 9 | |
def BinetFib number | |
phi = ((1 + Math.sqrt(5)) / 2) #or 1.6180339887 | |
divid = phi**number | |
divider = Math.sqrt(5) | |
(divid / divider).round | |
end | |
puts BinetFib(fib); |
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def sum_digits digit | |
if digit < 10 | |
digit | |
else | |
(digit % 10) + (digit / 10).to_f | |
end | |
end | |
def validate number | |
number = number.to_s.reverse.to_i |
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# Set cover problem | |
states = ['mt', 'wa', 'or', 'id', 'nv', 'ut', 'ca', 'az'].uniq | |
station = {} | |
station["kone"] = ['id', 'nv', 'ut'].uniq | |
station["ktwo"] = ['mt', 'wa', 'id'].uniq | |
station["kthree"] = ['or', 'nv', 'ca'].uniq | |
station["kfour"] = ['nv', 'ut'].uniq | |
station["kfive"] = ['ca', 'az'].uniq |